Taking into account the definition of density, the density of mercury is 15.3 g/mL.
Density is defined as the property that matter has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
It can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
In this case, you know that:
Replacing in the definition of density:
density= 306 g÷ 20 mL
Solving:
density= 15.3 g/mL
In summary, the density of mercury is 15.3 g/mL.
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